A method of chamfering slabs during rolling by a rolling mill

Abstract

The invention discloses a method for achieving the chamfering purpose during rolling of a slab rolling mill. According to the method, the slab chamfering effect can be achieved by accurately controlling head and tail roller gaps during slab rolling, and therefore the defects of slab fire cutting chamfering are avoided, the purposes of preventing rolling defects and omitting the slab fire cutting chamfering procedure are achieved, and chamfering can be achieved on all rolling slabs. Due to the fact that the original slab fire cutting chamfering technology is long in consumed operation time, high in logistics difficulty, low in efficiency and high in cost, the normal rolling process is adopted in the method, the slab chamfering problem is solved very well, and the purpose and effect of slab fire cutting chamfering are achieved. The method is an innovation for rolling defect controlling of plates with moderate thicknesses, the slab fire cutting technology can be completely replaced by the method, the efficiency is high, and the method has substantive characters and progress and is novel, creative and practical. The method does not have a negative effect on the environment, and can be popularized in all moderate thickness plate enterprises at home and abroad.

Description

Technical field [0001] The invention relates to a production method of metallurgical thick plates, in particular to a production method for fire cutting and chamfering thick plates and slabs for hot processing and rolling mills. The method can obtain the fire-cut chamfering effect of the conventional slab. Background technique [0002] In the existing rolling process adopted by metallurgical thick plate plants, one of the solutions to avoid rolling defects is to chamfer the four edges of the width of the slab by fire cutting. [0003] Since the slab is cooled by a continuous casting mold, there is usually overcooling on the four edges and corners of the slab, which causes the composition and structure to be significantly different from the core. Therefore, during the slab rolling process, the edges are prone to defects . [0004] The purpose of slab chamfering is to consider from the perspective of metal flow. Through the chamfering of the edges, the defect-prone parts of the edges...

AI Technical Summary

Problems solved by technology

[0007] The slab needs to be hoisted to the designated site, which increases the number of slab hoisting and off-line, and at the same time increases the difficulty of logistics and affects efficiency;

[0008] High-temperature slabs cannot be fire-cut. If fire-cutting after waiting for temperature is performed, the slabs cannot be installed in the furnace in time, which will affect the delivery date. Therefore, usually only part of the slabs can be chamfered, but it takes too long ;

[0009] In this way, although the fire-cut chamfering operation is an unnecessary process, it consumes a lot of manpower and material resources, and the cost increases

[0010] In addition, many slabs may not have edge defects without chamfering. Therefore, the work of fire-cutting and chamfering some slabs may be useless, that is, the efficiency is low

And many slabs that are not scheduled for fire-cut chamfering may also have edge defects. In this way, if all slabs are chamfered, the chamfering efficiency is too low

Due to the long time for chamfering by fire cutting in the original chamfering process, additional fire cutting space is required, and the multiple stacking of slabs affects logistics, and it is impossible to realize all the chamfering of slabs

[0011] In addition, in the past, the fire-cutting and chamfering of slabs was carried out before the slabs were heated. As a result, the chamfering efficiency was too low, the chamfering time was long, and additional fire-cutting sites were required. logistics, high cost

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